And in less than 50 years, you and AI will grow from tribes to Kingdoms and colonise that much, there will be no room (at least in Europe) and you have to make alliances, wage wars and manage your conquered lands, or recover from the lost of yours. Now, you have to colonise provinces, which is much more cheaper and faster, than in vanilla, and fight barbarians, that will give your military a job to do. So, you've started the game as one of the civs.
